Non-curling adhesive for mounting photographs, &amp;c.



NATHANIEL B. AUKERMAN, OF INGRAM, PENNSYLVANIA.

'NON-C'ORLING ADHESIVE 'Fon nou'u'rmo rno'roe'narns, &c.

Specification of Letters Patent.

Application filed January 2, 1908.

Patented Dec. 15, 1908.

Serial No. 408,954.

To all whom it may concern:

Be it known that I, NATHANIEL BARNHART AUKERMAN, a citizen of the United States, residing at Ingram, in the County of Allegheny and State of Pennsylvania, have invented a new and useful com osition of matter in the form of a non-cur ing adhesive to been the large percentage of water which they contain, the moisture expands the article to be mounted and on drying contracts which warps the mount to such extent as to make it impractical to use in many cases. Also water mixed adhesives will strike through into the mount and are very liable to dissolve and distribute to the print injurious chemicals which will ruin it irredeemably often destroying a work which is invaluable and cannot be replaced.

It will be observed that in my formula and process hereinafter described that I have reduced the amount of water to a very low percentage.

The small amount of Water remaining is held in subjection by other nonex anding ingredients. iIy composition consists of the followin ingredients, combined in substantially the plrplportions given and in the manner speciviz.

G1ue(No.1 white flake) 18028- alcohol (wood or grain 63 ozs. Nitric acid C. P... 7 drama \\hitedextrin 4502s. Glycerin.E ..f 12 01s.

ssenceo permm' t Perfume{ of z g }equal parts.... 2 drains.

Xo. 1 white glue is specified in formula. Other forms of glue, however, work successfully and may be used, if so desired.

These ingredients are combined in the following manner: The glue is immersed for thirty seconds in a three er cent. solution of liquid by heatin after this treatment, it however the glue akes are of such thickness that the former treatment will not sufiice then it may be a ain immersed and drained immediately. T e glue treated as above is now placed in a double boiler or similar arrangement where an even temperature may be maintained not to excee the boilin point, which will bring the glue to a liqui mass.

IVhen thoroughly melted, the alcohol containing the nitric acid is added slowly while the mass is violently agitated or stirred, the mixture in the meantime. being allowed to cool gradually until it has reached a temperature of eighty degrees Fahrenheit on the final addition of alcohol. The dextrin is then added which having a strong aflinity for water takes u the'moisture contained in the mixture which in turn is held im risoned by T e glycerin I the glycerin which follows. also prevents adhesive from drying too rapidly when being used.

The perfume specified makes an agreeable combination however essential oils as desired may be used.

In using the above named composition it is essential that the article to be mounted be thoroughly dry, the adhesive is then applied with bristle brush or finger as in the case of ordinary adhesives or pastes. Owing to its lack of water it will not make the print limp therefore it is necessary to keep it 1n contact with mount under pressure until paste sets which will take place in a few minutes.

Photographs etc. mounted with this preparation retain all their natural luster and brilliancy and on account ofits eculiarly dry consistency does not strike t ough either print or mount but instead only adheres to each thereby forming a wall of protection between the two thus preventing injurious chemicals in mount from escaping into the rint which is a valuable feature owing to its eing a well known and deplorable fact that hyposulfit-e of soda and other chemicals used in the manufacture of card boards and papers is the mortal enemy of nearly if not all photographic processes.

3 I am aware that compositions consisting principally of glue and alcohol have been used, these however to my knowledge all contained enou h free moisture as to render them unsuccess 111 and impractical to use owing to their not maintaining a working consistency when cold and on heating became so thoroughlyli uid as to make it impracticaltent by high or low temperatures may be so adjusted as to adapt it to varying climates or seasons, this is accomplished by increasing or diminishing the quantities of nitric acid and glycerin.

I claim.

1. The herein described composition of matter consisting of glue, alcohol, nitricacid,

dextrin, glycerin and perfume substantially as desc ed and for the purpose specified.

2. The herein described composition of nitric acid seven drams, white dextrin forty five ounces, glycerin twelve-ounces, oil of lavender and essence of peppermint equal parts two drains substantially as described.

N. B. AUKERMAN.

Witnesses:

E. S. AUKERMAN, EU'LALIA AUKERMAN 

